No, he had no clue, and the language difference didn't help. I think it's a little too deeply cut for an "S" shield. Overall, it's very nicely made, and about 1/16" in thickness. It doesn't look like a one off, but who knows? I see Ritmo Sereno doing some S/RS shaped custom fairings. Perhaps this was an earlier model?

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I was was riding in the hills last week and a damn goat came and knocked me off my bike. There behooves all up in my face and shit...